drivers/regulator/pv88060-regulator.c

   1 /*
   2  * pv88060-regulator.c - Regulator device driver for PV88060
   3  * Copyright (C) 2015  Powerventure Semiconductor Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/i2c.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regmap.h>
  25 #include <linux/irq.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/regulator/of_regulator.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/uaccess.h>
  30 #include "pv88060-regulator.h"
  31
  32 #define PV88060_MAX_REGULATORS  14
  33
  34 /* PV88060 REGULATOR IDs */
  35 enum {
  36         /* BUCKs */
  37         PV88060_ID_BUCK1,
  38
  39         /* LDOs */
  40         PV88060_ID_LDO1,
  41         PV88060_ID_LDO2,
  42         PV88060_ID_LDO3,
  43         PV88060_ID_LDO4,
  44         PV88060_ID_LDO5,
  45         PV88060_ID_LDO6,
  46         PV88060_ID_LDO7,
  47
  48         /* SWTs */
  49         PV88060_ID_SW1,
  50         PV88060_ID_SW2,
  51         PV88060_ID_SW3,
  52         PV88060_ID_SW4,
  53         PV88060_ID_SW5,
  54         PV88060_ID_SW6,
  55 };
  56
  57 struct pv88060_regulator {
  58         struct regulator_desc desc;
  59         /* Current limiting */
  60         unsigned        n_current_limits;
  61         const int       *current_limits;
  62         unsigned int limit_mask;
  63         unsigned int conf;              /* buck configuration register */
  64 };
  65
  66 struct pv88060 {
  67         struct device *dev;
  68         struct regmap *regmap;
  69         struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
  70 };
  71
  72 static const struct regmap_config pv88060_regmap_config = {
  73         .reg_bits = 8,
  74         .val_bits = 8,
  75 };
  76
  77 /* Current limits array (in uA) for BUCK1
  78  * Entry indexes corresponds to register values.
  79  */
  80
  81 static const int pv88060_buck1_limits[] = {
  82         1496000, 2393000, 3291000, 4189000
  83 };
  84
  85 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
  86 {
  87         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
  88         unsigned int data;
  89         int ret, mode = 0;
  90
  91         ret = regmap_read(rdev->regmap, info->conf, &data);
  92         if (ret < 0)
  93                 return ret;
  94
  95         switch (data & PV88060_BUCK_MODE_MASK) {
  96         case PV88060_BUCK_MODE_SYNC:
  97                 mode = REGULATOR_MODE_FAST;
  98                 break;
  99         case PV88060_BUCK_MODE_AUTO:
 100                 mode = REGULATOR_MODE_NORMAL;
 101                 break;
 102         case PV88060_BUCK_MODE_SLEEP:
 103                 mode = REGULATOR_MODE_STANDBY;
 104                 break;
 105         }
 106
 107         return mode;
 108 }
 109
 110 static int pv88060_buck_set_mode(struct regulator_dev *rdev,
 111                                         unsigned int mode)
 112 {
 113         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 114         int val = 0;
 115
 116         switch (mode) {
 117         case REGULATOR_MODE_FAST:
 118                 val = PV88060_BUCK_MODE_SYNC;
 119                 break;
 120         case REGULATOR_MODE_NORMAL:
 121                 val = PV88060_BUCK_MODE_AUTO;
 122                 break;
 123         case REGULATOR_MODE_STANDBY:
 124                 val = PV88060_BUCK_MODE_SLEEP;
 125                 break;
 126         default:
 127                 return -EINVAL;
 128         }
 129
 130         return regmap_update_bits(rdev->regmap, info->conf,
 131                                         PV88060_BUCK_MODE_MASK, val);
 132 }
 133
 134 static int pv88060_set_current_limit(struct regulator_dev *rdev, int min,
 135                                     int max)
 136 {
 137         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 138         int i;
 139
 140         /* search for closest to maximum */
 141         for (i = info->n_current_limits; i >= 0; i--) {
 142                 if (min <= info->current_limits[i]
 143                         && max >= info->current_limits[i]) {
 144                         return regmap_update_bits(rdev->regmap,
 145                                 info->conf,
 146                                 info->limit_mask,
 147                                 i << PV88060_BUCK_ILIM_SHIFT);
 148                 }
 149         }
 150
 151         return -EINVAL;
 152 }
 153
 154 static int pv88060_get_current_limit(struct regulator_dev *rdev)
 155 {
 156         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 157         unsigned int data;
 158         int ret;
 159
 160         ret = regmap_read(rdev->regmap, info->conf, &data);
 161         if (ret < 0)
 162                 return ret;
 163
 164         data = (data & info->limit_mask) >> PV88060_BUCK_ILIM_SHIFT;
 165         return info->current_limits[data];
 166 }
 167
 168 static struct regulator_ops pv88060_buck_ops = {
 169         .get_mode = pv88060_buck_get_mode,
 170         .set_mode = pv88060_buck_set_mode,
 171         .enable = regulator_enable_regmap,
 172         .disable = regulator_disable_regmap,
 173         .is_enabled = regulator_is_enabled_regmap,
 174         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 175         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 176         .list_voltage = regulator_list_voltage_linear,
 177         .set_current_limit = pv88060_set_current_limit,
 178         .get_current_limit = pv88060_get_current_limit,
 179 };
 180
 181 static struct regulator_ops pv88060_ldo_ops = {
 182         .enable = regulator_enable_regmap,
 183         .disable = regulator_disable_regmap,
 184         .is_enabled = regulator_is_enabled_regmap,
 185         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 186         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 187         .list_voltage = regulator_list_voltage_linear,
 188 };
 189
 190 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
 191 {\
 192         .desc   =       {\
 193                 .id = chip##_ID_##regl_name,\
 194                 .name = __stringify(chip##_##regl_name),\
 195                 .of_match = of_match_ptr(#regl_name),\
 196                 .regulators_node = of_match_ptr("regulators"),\
 197                 .type = REGULATOR_VOLTAGE,\
 198                 .owner = THIS_MODULE,\
 199                 .ops = &pv88060_buck_ops,\
 200                 .min_uV = min,\
 201                 .uV_step = step,\
 202                 .n_voltages = ((max) - (min))/(step) + 1,\
 203                 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
 204                 .enable_mask = PV88060_BUCK_EN, \
 205                 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
 206                 .vsel_mask = PV88060_VBUCK_MASK,\
 207         },\
 208         .current_limits = limits_array,\
 209         .n_current_limits = ARRAY_SIZE(limits_array),\
 210         .limit_mask = PV88060_BUCK_ILIM_MASK, \
 211         .conf = PV88060_REG_##regl_name##_CONF1,\
 212 }
 213
 214 #define PV88060_LDO(chip, regl_name, min, step, max) \
 215 {\
 216         .desc   =       {\
 217                 .id = chip##_ID_##regl_name,\
 218                 .name = __stringify(chip##_##regl_name),\
 219                 .of_match = of_match_ptr(#regl_name),\
 220                 .regulators_node = of_match_ptr("regulators"),\
 221                 .type = REGULATOR_VOLTAGE,\
 222                 .owner = THIS_MODULE,\
 223                 .ops = &pv88060_ldo_ops,\
 224                 .min_uV = min, \
 225                 .uV_step = step, \
 226                 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
 227                 .enable_reg = PV88060_REG_##regl_name##_CONF, \
 228                 .enable_mask = PV88060_LDO_EN, \
 229                 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
 230                 .vsel_mask = PV88060_VLDO_MASK, \
 231         },\
 232 }
 233
 234 #define PV88060_SW(chip, regl_name, max) \
 235 {\
 236         .desc   =       {\
 237                 .id = chip##_ID_##regl_name,\
 238                 .name = __stringify(chip##_##regl_name),\
 239                 .of_match = of_match_ptr(#regl_name),\
 240                 .regulators_node = of_match_ptr("regulators"),\
 241                 .type = REGULATOR_VOLTAGE,\
 242                 .owner = THIS_MODULE,\
 243                 .ops = &pv88060_ldo_ops,\
 244                 .min_uV = max,\
 245                 .uV_step = 0,\
 246                 .n_voltages = 1,\
 247                 .enable_reg = PV88060_REG_##regl_name##_CONF,\
 248                 .enable_mask = PV88060_SW_EN,\
 249         },\
 250 }
 251
 252 static const struct pv88060_regulator pv88060_regulator_info[] = {
 253         PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
 254                 pv88060_buck1_limits),
 255         PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
 256         PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
 257         PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
 258         PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
 259         PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
 260         PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
 261         PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
 262         PV88060_SW(PV88060, SW1, 5000000),
 263         PV88060_SW(PV88060, SW2, 5000000),
 264         PV88060_SW(PV88060, SW3, 5000000),
 265         PV88060_SW(PV88060, SW4, 5000000),
 266         PV88060_SW(PV88060, SW5, 5000000),
 267         PV88060_SW(PV88060, SW6, 5000000),
 268 };
 269
 270 static irqreturn_t pv88060_irq_handler(int irq, void *data)
 271 {
 272         struct pv88060 *chip = data;
 273         int i, reg_val, err, ret = IRQ_NONE;
 274
 275         err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
 276         if (err < 0)
 277                 goto error_i2c;
 278
 279         if (reg_val & PV88060_E_VDD_FLT) {
 280                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 281                         if (chip->rdev[i] != NULL) {
 282                                 regulator_notifier_call_chain(chip->rdev[i],
 283                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 284                                         NULL);
 285                         }
 286                 }
 287
 288                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 289                         PV88060_E_VDD_FLT);
 290                 if (err < 0)
 291                         goto error_i2c;
 292
 293                 ret = IRQ_HANDLED;
 294         }
 295
 296         if (reg_val & PV88060_E_OVER_TEMP) {
 297                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 298                         if (chip->rdev[i] != NULL) {
 299                                 regulator_notifier_call_chain(chip->rdev[i],
 300                                         REGULATOR_EVENT_OVER_TEMP,
 301                                         NULL);
 302                         }
 303                 }
 304
 305                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 306                         PV88060_E_OVER_TEMP);
 307                 if (err < 0)
 308                         goto error_i2c;
 309
 310                 ret = IRQ_HANDLED;
 311         }
 312
 313         return ret;
 314
 315 error_i2c:
 316         dev_err(chip->dev, "I2C error : %d\n", err);
 317         return IRQ_NONE;
 318 }
 319
 320 /*
 321  * I2C driver interface functions
 322  */
 323 static int pv88060_i2c_probe(struct i2c_client *i2c,
 324                 const struct i2c_device_id *id)
 325 {
 326         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 327         struct pv88060 *chip;
 328         struct regulator_config config = { };
 329         int error, i, ret = 0;
 330
 331         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
 332         if (!chip)
 333                 return -ENOMEM;
 334
 335         chip->dev = &i2c->dev;
 336         chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
 337         if (IS_ERR(chip->regmap)) {
 338                 error = PTR_ERR(chip->regmap);
 339                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 340                         error);
 341                 return error;
 342         }
 343
 344         i2c_set_clientdata(i2c, chip);
 345
 346         if (i2c->irq != 0) {
 347                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
 348                 if (ret < 0) {
 349                         dev_err(chip->dev,
 350                                 "Failed to mask A reg: %d\n", ret);
 351                         return ret;
 352                 }
 353
 354                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
 355                 if (ret < 0) {
 356                         dev_err(chip->dev,
 357                                 "Failed to mask B reg: %d\n", ret);
 358                         return ret;
 359                 }
 360
 361                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
 362                 if (ret < 0) {
 363                         dev_err(chip->dev,
 364                                 "Failed to mask C reg: %d\n", ret);
 365                         return ret;
 366                 }
 367
 368                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 369                                         pv88060_irq_handler,
 370                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 371                                         "pv88060", chip);
 372                 if (ret != 0) {
 373                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 374                                 i2c->irq);
 375                         return ret;
 376                 }
 377
 378                 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
 379                         PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
 380                 if (ret < 0) {
 381                         dev_err(chip->dev,
 382                                 "Failed to update mask reg: %d\n", ret);
 383                         return ret;
 384                 }
 385
 386         } else {
 387                 dev_warn(chip->dev, "No IRQ configured\n");
 388         }
 389
 390         config.dev = chip->dev;
 391         config.regmap = chip->regmap;
 392
 393         for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 394                 if (init_data)
 395                         config.init_data = &init_data[i];
 396
 397                 config.driver_data = (void *)&pv88060_regulator_info[i];
 398                 chip->rdev[i] = devm_regulator_register(chip->dev,
 399                         &pv88060_regulator_info[i].desc, &config);
 400                 if (IS_ERR(chip->rdev[i])) {
 401                         dev_err(chip->dev,
 402                                 "Failed to register PV88060 regulator\n");
 403                         return PTR_ERR(chip->rdev[i]);
 404                 }
 405         }
 406
 407         return 0;
 408 }
 409
 410 static const struct i2c_device_id pv88060_i2c_id[] = {
 411         {"pv88060", 0},
 412         {},
 413 };
 414 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
 415
 416 #ifdef CONFIG_OF
 417 static const struct of_device_id pv88060_dt_ids[] = {
 418         { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
 419         {},
 420 };
 421 MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
 422 #endif
 423
 424 static struct i2c_driver pv88060_regulator_driver = {
 425         .driver = {
 426                 .name = "pv88060",
 427                 .of_match_table = of_match_ptr(pv88060_dt_ids),
 428         },
 429         .probe = pv88060_i2c_probe,
 430         .id_table = pv88060_i2c_id,
 431 };
 432
 433 module_i2c_driver(pv88060_regulator_driver);
 434
 435 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 436 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
 437 MODULE_LICENSE("GPL");